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???????????1990??1997??1997??2003??1994??2006??????????????????????λ??????о???Ms8.0???????????Ms6.1?????????????????????????????????????????????????????????????????????????μ???????????????????????????????????????μ??Χ??????????????????10???????????????????????????????????????????????????????1997??2003?????????????????????????????????????????

NEGATIVE DISLOCATION MODEL OF VERTICAL CRUSTAL MOVEMENT AND BACKGROUND BEFORE WENCHUAN AND PANZHIHUA EARTHQUAKES

By use of the regional leveling observations of the western Sichuan in the periods of 1990—1997, 1997—2003 and 1994—2006 and the aid of inversion of negative dislocation，the characteristics of tectonic deformation and strain accumulation background of correlative and neighbor faults before the Wenchuan Ms8.0 earthquake and the Panzhihua Ms6.1 earthquake are researched. It is concluded that there is obvious uplift in the large region according with its background of successive movement and long term (over 10 years) strain accumulation on the northern segment of Anninghe fault and the southern segment of Xianshuihe fault and the region they meet Longmenshan fault，reflecting the background of the Wenchuan Ms8.0 earthquake to some extent.Moreover, the acceleration of stain accumulation during 1997—2003 on the southern segment of Yuanmou luzhijiang fault may reflect the background of the Panzhihua Ms6.1 earthquake.